<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3//EN">
<HTML><HEAD>
		<TITLE>QuickStart Guide - Glossary</TITLE>
		<META HTTP-EQUIV="keywords" CONTENT="GRAPHICS VISUALIZATION VISUAL PROGRAM DATA
MINING">
	<meta http-equiv="content-type" content="text/html;charset=ISO-8859-1">
</HEAD><BODY BGCOLOR="#FFFFFF" link="#00004b" vlink="#4b004b">
		<TABLE width=510 border=0 cellpadding=0 cellspacing=0>
			<TR>
				<TD><IMG src="../images/spacer.gif" width=80 height=1></TD>
				<TD><IMG src="../images/spacer.gif" width=49 height=1></TD>
				<TD><IMG src="../images/spacer.gif" width=24 height=1></TD>
				<TD><IMG src="../images/spacer.gif" width=100 height=1></TD>
				<TD><IMG src="../images/spacer.gif" width=3 height=1></TD>
				<TD><IMG src="../images/spacer.gif" width=127 height=1></TD>
				<TD><IMG src="../images/spacer.gif" width=6 height=1></TD>
				<TD><IMG src="../images/spacer.gif" width=50 height=1></TD>
				<TD><IMG src="../images/spacer.gif" width=71 height=1></TD>
			</TR>
			<TR>
				<TD colspan=9><IMG src="../images/flcgh_01.gif" width=510 height=24 alt="OpenDX Documentation"></TD>
			</TR>
			<TR>
				<TD colspan=2><A href="../allguide.htm"><IMG src="../images/flcgh_02.gif" width=129 height=25 border="0" alt="Full Contents"></A></TD>
				<TD colspan=3><A href="../qikguide.htm"><B><IMG src="../images/flcgh_03d.gif" width=127 height=25 border="0" alt="QuickStart Guide"></B></A></TD>
				<TD><A href="../usrguide.htm"><IMG src="../images/flcgh_04.gif" width=127 height=25 border="0" alt="User's Guide"></A></TD>
				<TD colspan=3><A href="../refguide.htm"><IMG src="../images/flcgh_05.gif" width=127 height=25 border="0" alt="User's Reference"></A></TD>
			</TR>
			<TR>
				<TD><A href="qikgu032.htm"><IMG src="../images/flcgh_06.gif" width=80 height=17 border="0" alt="Previous Page"></A></TD>
				<TD colspan=2><A href="qikgu035.htm"><IMG src="../images/flcgh_07.gif" width=73 height=17 border="0" alt="Next Page"></A></TD>
				<TD><A href="../qikguide.htm"><IMG src="../images/flcgh_08.gif" width=100 height=17 border="0" alt="Table of Contents"></A></TD>
				<TD colspan=3><A href="qikgu033.htm"><IMG src="../images/flcgh_09.gif" width=136 height=17 border="0" alt="Partial Table of Contents"></A></TD>
				<TD><A href="qikgu035.htm"><IMG src="../images/flcgh_10.gif" width=50 height=17 border="0" alt="Index"></A></TD>
				<TD><A href="../srchindx.htm"><IMG src="../images/flcgh_11.gif" width=71 height=17 border="0" alt="Search"></A></TD>
			</TR>
		</TABLE>
		<H2>Chapter 7. Glossary</H2>
		<P>
Some of the definitions in this glossary are taken from the
<CITE>IBM Dictionary of Computing</CITE>, ZC20-1699.

		<TABLE CELLPADDING="3">
<TR><TD COLSPAN="2"><STRONG>A
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>accelerator
</TD><TD><P>A keystroke sequence that reduces the number of steps needed to
complete a task.
</TD></TR><TR VALIGN="TOP"><TD><P>anchor window
</TD><TD><P>The window in which a Data Explorer session starts (either the
Visual
Program Editor or the Image window).
The window is identified by an anchor symbol
in the top left corner.
When this window is closed, the Data Explorer session ends.
</TD></TR><TR VALIGN="TOP"><TD><P>array
</TD><TD><P>In Data Explorer, an array structure containing an ordered list of
data
items of the same type along with additional descriptive
information.
</TD></TR><TR><TD COLSPAN="2"><STRONG>B
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>Browser
</TD><TD><P>A Data Explorer user interface for determining the layout and
organization
of data in a file.
</TD></TR><TR><TD COLSPAN="2"><STRONG>C
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>camera
</TD><TD><P>An object that describes the viewing parameters of an image (e.g.,
width of the viewport, viewer&#39;s location relative to the
object, and the resolution and aspect ratio of the
image).
A camera may be explicitly defined and passed as a parameter to the
Render or Display module.
It may also be implicitly defined in the use of interactive,
mouse-driven options (such as zoom or rotate) in the
Image window.
</TD></TR><TR VALIGN="TOP"><TD><P>canvas
</TD><TD><P>The area of a VPE window used in building and editing
visual programs.
</TD></TR><TR VALIGN="TOP"><TD><P>cell-centered data
</TD><TD><P>See <I>connection-dependent data</I>.
</TD></TR><TR VALIGN="TOP"><TD><P>clipping plane
</TD><TD><P>A plane that divides a 3-dimensional object into a rendered and
an unrendered region, making the object&#39;s interior visible.
</TD></TR><TR VALIGN="TOP"><TD><P>colormap
</TD><TD><P>In Data Explorer, a color map that relates colors to data values.
The colors are carried in the map&#39;s "data" component and the
data values to which each color applies
in its "positions" component.
</TD></TR><TR VALIGN="TOP"><TD><P>Colormap Editor
</TD><TD><P>A Data Explorer user interface for mapping precise colors to
specified data values,
the results of which are displayed in a visual image.
</TD></TR><TR VALIGN="TOP"><TD><P>component
</TD><TD><P>A basic part of a field (such as "positions," "data,"
or "colors"); each component is indexed by a string (e.g.,
"positions"), and its value is typically an array
object (e.g., the list of position values).
</TD></TR><TR VALIGN="TOP"><TD><P>connection
</TD><TD><P>Component of an IBM Data Explorer data field that specifies how a
set of points are joined together.
Also controls interpolation.
</TD></TR><TR VALIGN="TOP"><TD><P>connection-dependent data
</TD><TD><P>Cell-centered data.
The data value is interpreted as constant throughout the connection
element.
</TD></TR><TR VALIGN="TOP"><TD><P>contour
</TD><TD><P>On a surface, a line that connects points having the same data
value (e.g., pressure, depth, temperature).
</TD></TR><TR VALIGN="TOP"><TD><P>control panel
</TD><TD><P>A Data Explorer interactive window that facilitates setting and
changing
the parameters of visual programs.
</TD></TR><TR VALIGN="TOP"><TD><P>cube
</TD><TD><P>A volumetric connection element that connects eight positions in a
data field.
</TD></TR><TR VALIGN="TOP"><TD><P>cutting plane
</TD><TD><P>An arbitrary plane, in 3-dimensional space, onto which
data are mapped.
</TD></TR><TR><TD COLSPAN="2"><STRONG>D
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>data-driven interactor
</TD><TD><P>Interactors whose attributes (such as minimum and maximum) are
set by an input data field.
</TD></TR><TR VALIGN="TOP"><TD><P>Data Prompter
</TD><TD><P>A graphical user interface that enables a user to describe the
format of the data in a file.
The prompter creates a General Array Format header file that is used
by the Import module to import the data.
</TD></TR><TR VALIGN="TOP"><TD><P>dialog box
</TD><TD><P>The "window" displayed when the user selects a pull-down
option that offers or requires more detailed specification.
</TD></TR><TR VALIGN="TOP"><TD><P>display
</TD><TD><P>(1) <I>v</I>. To present information for viewing, usually on a
terminal screen or a hard-copy device.
<BR>(2) <I>n</I>. A device or medium on which information is presented,
such as a terminal screen.
<BR>(3) Deprecated term for <I>panel</I>.
</TD></TR><TR VALIGN="TOP"><TD><P>Display module
</TD><TD><P>A non-interactive module for displaying an Image.
See Image window.
</TD></TR><TR><TD COLSPAN="2"><STRONG>E
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>element
</TD><TD><P>See <I>connection</I>.
</TD></TR><TR VALIGN="TOP"><TD><P>executive
</TD><TD><P>The component of the Data Explorer system that manages the execution
of
specified modules.
The term often refers to the entire server portion of the Data Explorer
client-server model, including the executive, modules,
and data-management components.
</TD></TR><TR><TD COLSPAN="2"><STRONG>F
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>field
</TD><TD><P>A self-contained collection of data
items.
A Data Explorer field typically consists of the data itself (the "data"
component), a set of sample points (the "positions"
component), a set of interpolation elements (the
"connections" component), and other
information as needed.
</TD></TR><TR><TD COLSPAN="2"><STRONG>G
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>general array format
</TD><TD><P>A data-importing method that uses a header file to describe the
data format of a data file.
This "format" makes it possible to import data in a variety
of formats.
</TD></TR><TR VALIGN="TOP"><TD><P>glyph
</TD><TD><P>A graphical figure used to represent a particular
variable.
Each occurrence of a glyph represents a single value of the
associated variable.
Some attribute of the glyph (e.g., length or angle) is a function of
the variable and varies with it.
</TD></TR><TR VALIGN="TOP"><TD><P>group
</TD><TD><P>A collection of objects.
</TD></TR><TR><TD COLSPAN="2"><STRONG>I
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>icon
</TD><TD><P>A displayed symbol that a user can point to with a device such as a
mouse to select a particular operation or software application.
</TD></TR><TR VALIGN="TOP"><TD><P>Image window
</TD><TD><P>IBM Data Explorer window that displays the image generated by a
visual
program.
Associated with the Image window are special interactors
for 3-D viewing.
</TD></TR><TR VALIGN="TOP"><TD><P>interactor
</TD><TD><P>A Data Explorer device used to manipulate data in order to change
the
visual image produced by a program.
See also <I>data-driven interactor, interactor stand-in</I>.
</TD></TR><TR VALIGN="TOP"><TD><P>interactor stand-in
</TD><TD><P>An icon used in the VPE window to represent
an interactor.
Stand-ins are named after the type of data they generate:
<UL COMPACT>
<LI>integer
<LI>scalar
<LI>selector (outputs a value and a string)
<LI>string
<LI>value
<LI>vector.
</UL>
</TD></TR><TR VALIGN="TOP"><TD><P>interpolation element
</TD><TD><P>An item in the connections component array.
Each interpolation element provides a means for interpolating data
values at locations other than the specified set of sample points.
See <I>positions component</I>.
</TD></TR><TR VALIGN="TOP"><TD><P>invalid
</TD><TD><P>A classification of an array item (typically positions or
connections).
An invalid item is not rendered or realized.
</TD></TR><TR VALIGN="TOP"><TD><P>isosurface
</TD><TD><P>A surface in 3-dimensional space that connects all the points
in a data set that have the same value.
</TD></TR><TR VALIGN="TOP"><TD><P>isovalue
</TD><TD><P>The single value that characterizes each and every point
constituting an isosurface.
By default, this value is the average of all the data values in the
set being visualized.
</TD></TR><TR VALIGN="TOP"><TD><P>item
</TD><TD><P>A single piece of data in an array.
</TD></TR><TR><TD COLSPAN="2"><STRONG>L
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>line
</TD><TD><P>An element that connects two positions in a field.
</TD></TR><TR><TD COLSPAN="2"><STRONG>M
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>macro
</TD><TD><P>In IBM Data Explorer, a sequence of modules that acts as a
functional unit
and is displayed as a single icon.
Macros can also be defined in the Data Explorer scripting
language.
</TD></TR><TR VALIGN="TOP"><TD><P>menu bar
</TD><TD><P>In windows, a horizontal bar that displays the names of one or more
menus (or tasks).
When the user selects a menu, a pull-down list of options for that menu
is displayed.
</TD></TR><TR VALIGN="TOP"><TD><P>module
</TD><TD><P>(1) In IBM Data Explorer, a primitive function, such as Isosurface.
<BR>(2) In a VPE window, the icon for a module (also called a
<I>tool</I>, q.v.).
<BR>(3) A program unit that is functionally discrete and identifiable
(i.e., it can be assembled, compiled, combined with other units,
and so on).
</TD></TR><TR><TD COLSPAN="2"><STRONG>N
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>navigate
</TD><TD><P>To move the camera (changing the "to" and "from" points)
around the image scene, using the mouse.
</TD></TR><TR VALIGN="TOP"><TD><P>netCDF
</TD><TD><P>See <I>Network Common Data Form</I>.
</TD></TR><TR VALIGN="TOP"><TD><P>network
</TD><TD><P>In Data Explorer the set of tool modules, interactor stand-ins, and
connections that constitute a visual program.
In the VPE window, a network appears as a set of icons connected by
arcs.
</TD></TR><TR VALIGN="TOP"><TD><P>Network Common Data Form (netCDF)
</TD><TD><P>A data format that stores and retrieves scientific data in
self&#45;describing, multidimensional blocks (netCDF is not
a database management system, however).
netCDF is accessible with C and FORTRAN.
</TD></TR><TR><TD COLSPAN="2"><STRONG>O
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>object
</TD><TD><P>In IBM Data Explorer, any discrete and identifiable entity;
specifically,
a region of global memory that contains its own type-identification
and other type-specific information.
</TD></TR><TR VALIGN="TOP"><TD><P>opacity
</TD><TD><P>The capacity of matter to prevent the transmission of
light.
For a surface, an opacity of 1 means that it is completely opaque; an
opacity of 0, that it is completely transparent.
For volume, opacity is defined as the amount of attenuation (of
light) per unit distance.
</TD></TR><TR><TD COLSPAN="2"><STRONG>P
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>palette
</TD><TD><P>A displayed grouping of available selections (such as functions,
modules, or colors) in a GUI window.
</TD></TR><TR VALIGN="TOP"><TD><P>palindrome
</TD><TD><P>In Data Explorer, a mode of running a sequence of images in one
direction
and then in the opposite direction.
</TD></TR><TR VALIGN="TOP"><TD><P>pixel
</TD><TD><P>Picture element.
In computer graphics, the smallest element of a display surface that
can be independently assigned color and intensity.
</TD></TR><TR VALIGN="TOP"><TD><P>position-dependent data
</TD><TD><P>Data that are in one-to-one correspondence with positions.
</TD></TR><TR VALIGN="TOP"><TD><P>positions component
</TD><TD><P>A component that consists of a set of dimensional points in a
field.
</TD></TR><TR VALIGN="TOP"><TD><P>probe
</TD><TD><P>A list of one or more vectors that represent points in a
graphical image.
Probes can be used with Data Explorer tools that accept vectors as input (such
as ClipPlane and Streamline) or to control the view of an image.
</TD></TR><TR VALIGN="TOP"><TD><P>pull-down
</TD><TD><P>In windows, the list of options displayed when a task is selected
from the menu bar.
</TD></TR><TR><TD COLSPAN="2"><STRONG>Q
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>quad
</TD><TD><P>An element that connects four positions in a field.
</TD></TR><TR><TD COLSPAN="2"><STRONG>R
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>realization
</TD><TD><P>A description of how raw data is to be represented in terms of
boundaries, surfaces, transparency, color, and other graphical,
image, and geometric characteristics.
</TD></TR><TR VALIGN="TOP"><TD><P>rendering
</TD><TD><P>The generation of an image from some representation of an object,
such as a surface, or from volumetric information.
</TD></TR><TR VALIGN="TOP"><TD><P>ribbon
</TD><TD><P>A figure derived from lines (e.g., from streamlines and
streaklines).
Ribbons may twist to indicate vorticity.
</TD></TR><TR><TD COLSPAN="2"><STRONG>S
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>sample point
</TD><TD><P>A point that represents user data.
Data is interpolated between sample points by interpolation
elements (connections).
</TD></TR><TR VALIGN="TOP"><TD><P>scalar
</TD><TD><P>A non-vector value characterized by a single, real number.
</TD></TR><TR VALIGN="TOP"><TD><P>scatter data
</TD><TD><P>A collection of sample points without connections.
</TD></TR><TR VALIGN="TOP"><TD><P>scripting language
</TD><TD><P>The IBM Data Explorer command language.
Used for writing visual programs, to manage the execution of modules,
and to invoke visualization functions.
</TD></TR><TR VALIGN="TOP"><TD><P>scroll
</TD><TD><P>To move all or part of the display image vertically
or horizontally to display
data that cannot be observed in a single display image.
</TD></TR><TR VALIGN="TOP"><TD><P>Sequencer
</TD><TD><P>An IBM Data Explorer tool for creating "animated" sequences of
images.
</TD></TR><TR VALIGN="TOP"><TD><P>series
</TD><TD><P>In IBM Data Explorer, used to represent a single field sampled
across
some parameter (e.g., a simulation of a CMOS device across a
temperature range).
</TD></TR><TR VALIGN="TOP"><TD><P>stand-in
</TD><TD><P>See <I>interactor stand-in</I>.
</TD></TR><TR VALIGN="TOP"><TD><P>streaklines
</TD><TD><P>Lines that represent the path of particles in a changing vector
field.
Also called rakes.
</TD></TR><TR VALIGN="TOP"><TD><P>streamlines
</TD><TD><P>Lines that represent the path of particles in a vector field at
a particular time.
Also called flow lines.
</TD></TR><TR><TD COLSPAN="2"><STRONG>T
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>tetrahedron
</TD><TD><P>A volumetric connection element that connects four positions in
a field.
</TD></TR><TR VALIGN="TOP"><TD><P>tool
</TD><TD><P>In IBM Data Explorer, a general term for any icon used to build a
visual program (specifically, module, macro, or interactor
stand-in).
</TD></TR><TR VALIGN="TOP"><TD><P>triangle
</TD><TD><P>A connection element that connects three positions in a field.
</TD></TR><TR VALIGN="TOP"><TD><P>tube
</TD><TD><P>A surface centered on a deriving line (e.g., a streamline or
streakline).
Tubes may twist to indicate vorticity.
</TD></TR><TR><TD COLSPAN="2"><STRONG>V
</STRONG>
					<P></TD></TR><TR VALIGN="TOP"><TD><P>vector
</TD><TD><P>A quantity characterized by more than one component.
</TD></TR><TR VALIGN="TOP"><TD><P>vertex
</TD><TD><P>One of the positions that define a connection element.
</TD></TR><TR VALIGN="TOP"><TD><P>visual program
</TD><TD><P>A user-specified interconnected set of Data Explorer modules that
performs
a sequence of operations on data and typically produces an image
as output.
</TD></TR><TR VALIGN="TOP"><TD><P>Visual Program Editor (VPE)
</TD><TD><P>IBM Data Explorer window used to create and edit visual programs and
macros.
See also <I>canvas</I>.
</TD></TR><TR VALIGN="TOP"><TD><P>volume
</TD><TD><P>The amount of 3-dimensional space occupied by an object or substance
(measured in cubic units).
To be distinguished from an object&#39;s surface, which is a
mathematical abstraction.
</TD></TR><TR VALIGN="TOP"><TD><P>volume rendering
</TD><TD><P>A technique for using color and opacity to visualize all the data
in a 3-dimensional data set.
The internal details visualized may be physical (such as the structure
of a machine part) or they may represent characteristics
(such as fluid flow, temperature, or stress).
</TD></TR><TR VALIGN="TOP"><TD><P>vorticity
</TD><TD><P>Mathematically defined as the curl of a velocity field.
A particle in a velocity field with nonzero vorticity will rotate.
</TD></TR><TR VALIGN="TOP"><TD><P>VPE
</TD><TD><P>See <I>Visual Program Editor</I>.
</TD></TR></TABLE>
		<P>
		<HR>
		<DIV align="center">
			<P><A href="../allguide.htm"><IMG src="../images/foot-fc.gif" width="94" height="18" border="0" alt="Full Contents"></A> <A href="../qikguide.htm"><IMG src="../images/foot-qs.gif" width="94" height="18" border="0" alt="QuickStart Guide"></A> <A href="../usrguide.htm"><IMG src="../images/foot-ug.gif" width="94" height="18" border="0" alt="User's Guide"></A> <A href="../refguide.htm"><IMG src="../images/foot-ur.gif" width="94" height="18" border="0" alt="User's Reference"></A></P>
		</DIV>
		<DIV align="center">
			<P><FONT size="-1">[ <A href="http://www.research.ibm.com/dx">OpenDX Home at IBM</A>&nbsp;|&nbsp;<A href="http://www.opendx.org/">OpenDX.org</A>&nbsp;] </FONT></P>
			<P></P>
		</DIV>
		<P></P>
	</BODY></HTML>
